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. 2017 Jul 11;5:50. doi: 10.3389/fchem.2017.00050

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Copyright © 2017 Mellidou and Kanellis.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Major AsA biosynthetic pathways in plants. Asterisks indicate how transcription factors may influence AsA biosynthesis other than regulating gene transcription (^*enzyme activity, ^** translation). The cut arrows indicate simplified reactions with missing steps. PGI, Phosphoglucose Isomerase; PMI, Mannose-6-phosphate isomerase; PMM, Phosphomannomutase; GMP, GDP-_D-mannose pyrophosphorylase; GME, GDP-_D-mannose 3′ 5′ epimerase; GGP, GDP-_L-galactose-phosphorylase; GPP, _L-galactose-1-P phosphatase; GalDH, _L-galactose dehydrogenase; GLDH, _L-galactono-1,4-lactone dehydrogenase; GalUR, _D-galacturonate reductase.